osi levallois-perret



UNITED STATES PATENT OFFICE.

PIERRE CLERGET, 0F LEVALLOIS-PERRET, FRANCE, ASSIGNOR TO CLERGET, BLIN8c CIEL, OF LEVALLOIS-PERRET, FRANCE, A FRENCH COMPANY.

PROCESS OF CASTING CYLINDERS OF INTERNAL-COMBUSTION ENGINES.

No Drawing.

To all whom it may concern:

Be it known that I, PIERRE CLERGET, a citizen of the Republic of France,and residing at Levallois-Perret, in France, have invented certain newand useful Improvements in the Processes of Casting Cylinders ofInternal Combustion Engines, of which the following is a specification.

This invention relates to the cylinders of internal combustion enginesand has particular reference to a process for the construction of suchcylinders having a jacket or casing of a metal which is a: goodconductor of heat.

It is known to facilitate the cooling of the heads or combustion ends ofinternal combustion engine cylinders by using outer j ackets of a heatconducting metal and by providing the cylinder with cooling ribs of sucha metal. Aluminium is the metal most generally used for the purpose, butits use offers great dilficnlties as regards insuring a thorough contactbetween the metal constituting the head or combustion end and the metalof the cooling part.

This invention relates to a process of extreme simplicity for mountingon. a cylinder or liner of steel or cast iron a cooling fitting forinstance a jacket or casing of aluminium or other metal which is a goodconductor of heat.

The process chiefly consists in casting the aluminium fitting directonto a cylinder or liner of steel or other in aterial, the operationbeing carried out at different temperatures of the cylinder and of thefitting, these temperatures being such that the cooling brings about agreater contraction of the outer fitting, than of the inner cylinder orliner, so that the constituent metal of the fitting compresses the innercylinder after the cooling.

In order to carry out the process, it is sufiicient to raise the steelof the inner cylinder which may be provided at the upper and bottomportions with a flange or projecting rib, to a temperature which must besuflicient to produce a certain expansion of the cylinder, but whichmust remain considerably lower than the melting temperature ofaluminium. When the cylinder is thus heated, it is placed into a mold inwhich its outer surface will constitute the inner Specification ofLetters Patent.

Application filed March 18, 1918.

Patented July 8, 1919.

Serial No. 223,189.

core of the mold, aluminium is poured in, and then the whole is left tocool.

While cooling, the aluminium which at first had a high temperature, willcontract much more than the steel, and the fitting will effectually gripthe cylinder which it will surround like a hoop. A thorough contactsmooth or provided with suitable ribs or grooves and also provided ifdesired with water or air cooling devices.

The aluminium fittmg can be made of any desired shape, for instance withribs cast on or cut out from the solid after the casting, the said ribsbeing capable of being concentrically or radially superimposed on ribsor grooves of the steel cylinder.

The constituent metal of the fitting can be aluminium or an aluminiumalloy or any other metal, the only condition for carrying out theinvention being that the metal shall be a good conductor of heat.

The invention is applicable to cylinders having either integral ordetachable heads.

What I claim as my invention and desire to secure by Letters Patent isThe method of constructing an internal combustion engine cylindercomprising a liner or inner sleeve of wear resisting metal and a casingsurrounding the liner of metal having a high conductivity of heatconsisting in heating the liner to a temperature below the melting pointof the casing metal, and casting the casing around the heated liner as acore.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

PIERRE OLERGET.

l Vitnesses:

CHAS. P. PRESSLY, VIoToR DUPONT.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

